Abstract: The present invention provides a transformer including a first bobbin around which a primary coil is wound, a second bobbin which is disposed adjacent to the first bobbin and around which a secondary coil is wound, a core disposed across the first and second bobbins and forming a closed magnetic path. The core is divided into a first core positioned on the side where the first bobbin is present and a second core positioned on the side where the second bobbin is present, and an insulating member is interposed in a magnetically coupled portion between the first core and the second core, the insulating member including outer circumference sheaths that cover at least one of the first and second cores and a barrier interposed between the opposing surfaces of the first and second cores.

Abstract: An object of the present invention is to provide an inverter device that can readily prevent flickering on a light emitting apparatus even when the light emission level thereof lowers. To achieve the object, an inverter device according to the present invention includes a rectifier (2) that performs full-wave rectification on AC power (1), a switcher (3) that switches pulsating power having a cycle that is one-half the cycle of the AC power having undergone the full-wave rectification in the rectifier (2), a transformer (4) having a primary side to which the high-frequency power provided by the switcher (3) is inputted and a secondary side from which boosted AC power is outputted as supplied power to a light emitting apparatus (6), and a controller that controls the current of the supplied power by using the pulse width of an ON signal that activates the switching and is sent to the switcher (3).

Abstract: The present invention provides a transformer including a first bobbin (1) around which a primary coil (3) is wound, a second bobbin (2) which is disposed adjacent to the first bobbin (1) and around which a secondary coil (9) is wound, a core disposed across the first and second bobbins and forming a closed magnetic path. The core is divided into a first core (17) positioned on the side where the first bobbin is present and a second core (18) positioned on the side where the second bobbin is present, and an insulating member (14) is interposed in a magnetically coupled portion between the first core (17) and the second core (18), the insulating member (14) including outer circumference sheaths (16a) and (16b) that cover at least one of the first and second cores and a barrier (15) interposed between the opposing surfaces of the first and second cores.